Patent GB-191113693-A (GB)
Title: Improvements in Flushing Valves.
Inventor: TWYFORD THOMAS WILLIAM
IPC: E03D3/04
Filed: 1911-06-08
Granted: 1912-06-10
Abstract: 13,693. Twyford, T. W. June 8. [Cognate Application, 27,362/11.] Valves, closing after predetermined interval or flow.-Relates to flushing-valves which close after a predetermined interval of time independently of the release of the actuating-mechanism, and of the type in which the main valve is provided with a piston extension adapted to slide in a chamber which is raised and lowered by the actuating-mechanism. According to one part of the invention, a valve of the above type is provided with means such as those described in Specification 444/11 for ensuring the lapse of a predetermined interval of time between successive flushes. The valve 2, Fig. 1, has a piston extension 15 adapted to slide within a chamber 14 which is raised by a stem 17, 19 actuated by a lever 20. When the chamber 14 is raised, the valve 2 follows and allows the flush. Water in the inlet pipe 6 then flows through passages 8, 16 and gradually closes the valve 2. As the water passes through the outlet 27, it fills a bucket 25 attached to a rocking lever 23 bearing a counterweight 26. The lever 23 is thereby tilted and the connexion between the stems 19, 24 is broken. The valve 2 cannot be again operated until the water in the bucket 25 has escaped through an opening in the bottom, so causing the weight 26 to restore the lever 23 to its normal position. According to another part of the invention, Fig. 2, in a valve of the type in which the chamber 14 is first depressed and then lifted to raise the valve 2, a spring 31 is provided to cause the spindle 30 and chamber 14 to rise automatically on the release of the handle 29. To facilitate the expulsion of the water from the chamber 14 when it is depressed, a relief valve may be provided in the top of the chamber 14. To ensure a predetermined interval of time between successive flushes in a valve as shown in Fig. 2, a vessel 25, Fig. 6, is arranged in the outlet of the valve, the vessel being secured to a rocking lever 23 formed with a catch 39 which engages with a head 40 on the stem 41 of the valve 2 when the vessel 25 is full of water. The vessel 25 has an aperture to allow the water to escape, and when empty is restored to the position shown by a weight 26. Fig. 9 shows a modification in which the spring 42 which raises the actuating-lever 29 and chamber 14 is situated in a separate chamber of the valve casing. The spring surrounds a stem 43 pivoted to the lever 29. To ensure an interval of time between successive flushes, a float 45 is situated in an annular chamber 46 provided with a valvecontrolled outlet 47. To the float is attached a lever 50, 52. When the flush takes place, the chamber 46 fills with water, the float 45 rises, and causes the arm 52 of the lever to engage beneath the end of the stem 43. The lever 29 cannot be again depressed until the chamber 46 has been emptied and the lever 52 has been withdrawn from the stem 43. In a modification, instead of a float 45 a bucket pivoted to one end of a lever is employed. The other end of the lever is rocked and brings a projecting lug beneath the end of the stem 43. The valve may be actuated by a closet seat as shown in Fig. 14. Beneath the seat is a lever 59 which, when depressed, acts through a rod 60 and lever 29 to depress the stem 30 to which the rising and falling chamber of the valve is attached. When the seat again rises, the valve is free to open under the influence of the spring surrounding the stem 30. The valve may also be operated by a pedal in a similar manner.